+ View the NASA Portal + Center for Near-Earth Object Studies JPL Small-Body Database Browser Search: [ help ]   160657 (1999 XC142) Classification: Inner Main-belt Asteroid          SPK-ID: 2160657 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] [ show orbit diagram ] Orbital Elements at Epoch 2459200.5 (2020-Dec-17.0) TDB Reference: JPL 15 (heliocentric ecliptic J2000)  Element Value Uncertainty (1-sigma)   Units  e .09529101240890329 4.5443e-08   a 1.982075078338436 1.1034e-08 au q 1.79320113745311 8.768e-08 au i 24.0437609176304 5.2783e-06 deg node 67.37956063544188 1.1925e-05 deg peri 283.2638482445742 4.7679e-05 deg M 267.061310418121 5.529e-05 deg tp 2459463.631367180493 (2021-Sep-06.13136718) 0.00015804 TDB period 1019.244973338288 2.79 8.5109e-06 2.33e-08 d yr n .3532026249007714 2.9493e-09 deg/d Q 2.170949019223762 1.2085e-08 au   Orbit Determination Parameters    # obs. used (total)      573      data-arc span      8055 days (22.05 yr)      first obs. used      1998-04-28      last obs. used      2020-05-17      planetary ephem.      DE441      SB-pert. ephem.      SB441-N16      condition code      0      norm. resid. RMS      .49951      source      ORB      producer      Otto Matic      solution date      2021-Apr-13 20:02:15   Additional Information  Earth MOID = .894259 au   Jupiter MOID = 3.12476 au   T_jup = 3.747  [ show covariance matrix ] [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] Physical Parameter Table Parameter Symbol Value Units Sigma Reference Notes absolute magnitude H 16.31   n/a E2021B55   160657 (1999 XC142)          Discovered 1999-Dec-12 by LINEAR at Socorro Reference: 20070828/Numbers.arc Last Updated: 2007-08-30 [ Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances ] 2021-Apr-15 17:06 UT (server date/time)   Site Manager:   Ryan S. Park Webmaster:   Alan B. Chamberlin